A Columbia Gas spokeswoman said there were no leaks found in the area that would have caused the blast on Charlton Heights Road, but the utility continues to work with investigators.

Shawn Landa, 47, was inside the house when it exploded Saturday evening. He was flown to a hospital and was reported to be in serious condition. Allen Lisica, 61, who was in a house next door, was reported to be in fair condition. Both men were found under piles of debris.

“My neighbor’s chimney is in my living room, and the whole side of the house is waffled, and some structural damage has been done,” said Rick Ruffing, who lives two houses down from the home that blew up.

Ruffing said he was at a wedding at the time of the explosion. He spent the night with a friend and can’t live in his house right now.

The front door of the house that blew up was blasted across the street. The house there was also heavily damaged. Other people on the street are still marveling at the force of the explosion.

“Your heart skips a beat and you feel it internally,” said Pam DiIanni, who lives down the street. “It was a pretty big shockwave.”

“We have items from the house that blew up about 250 feet away from where the structure was located,” said Chief John Scott of the Moon Township Fire Department.

Scott said there are no obvious signs of what caused the explosion. The fire department evacuated all homes in the immediate area as a precaution. Many of the homes sustained damage from the explosion and several were found to be unsafe, so residents were not allowed to return to them.

Neighbors were dealt another shock on Sunday when police uncovered what they say was an indoor and outdoor marijuana grow operation at the house next door to the one that exploded.

Officers hauled out at least seven pot plants, some up to seven feet tall, from the house at 1660 Charlton Heights Road. They also found at least eight guns and ammunition, police said.

Officers say they first checked on the house because the owner's daughter called them, worried that she hadn't heard from her parents. Moon Township police said they found the home's windows blown out, and the owner, 61-year-old William Amend, was standing near the back door. He was allowed to leave and the home was evacuated.

"Later, the detectives got an anonymous tip that the resident at 1660 -- right after the home exploded -- was out back, cutting down marijuana plants and putting them in bags," Capt. Gregory Seamon said.

Police said they got a warrant to enter the home and found at least seven plants, up to 7 feet tall, along with equipment used for an indoor grow house, and a number of guns. They said Amend was arrested after going to the police station to see if he could return to the house.

"It was a surprise, and also taxing on the police department, because we're involved in that investigation (the explosion), which is a major investigation, and on the other hand we can't let that (the marijuana case) go by either, so we had to divert some resources to that investigation," Seamon said.

Police said they see no connection between the alleged marijuana operation and the explosion. Amend is the only person currently facing charges while both investigations continue.

Investigators also want to know more about Shawn Landa. Court records show he was charged with violating a protection from abuse order filed by his estranged wife this spring.

The application for a PFA reveals that Mrs. Landa said Mr. Landa threatened her life.

Tina Zucchero, a neighbor who heard the blast and knows the Landas, said, “I don’t want to comment on anything because we just don’t know, we don’t know what happened.”

Zucchero continued, “I just hope that the people that were injured are OK.”

3 The explosion that rocked a Moon Township neighborhood over the weekend - is still a mystery tonight. With investigators still in the dark about what sparked the blast that hurt two men. Channel Four Action News reporter Shannon Perrine is live -- outside what's left of that home -- As police pick through the rubble -- hoping to find some answers. 3 3 the man in the house that was leveled - shawn landa - is still in serious condition.the man who lived next door - alan lisica - is in better shape - he has some glass shards in his head and his body -but, he's expected to be fine.and police would like to talk to mr. landa about the explosion that turned his house into a pile of splinters. 3 TRACK: A PILE OF LUMBER - SCATTERED WITH MEMORIES. A FATHER'S DAY CARD - BLOWN TO THE CURB.Tina Zucchero/Neighbor clip 7221 @ :40-:52 "I was sitting in my living room. My husband and I were getting ready to go out for the evening and I was just waiting for him and I had my dog on my lap and it was like a sonic boom it was terrible." TRACK: SHE LIVES A FEW STREETS AWAY AND KNOWS ALL THE PEOPLE INVOLVED.Tina @ :59-1:01 "Nobody knew what was going on I thought a plane had gone down." TRACK: TODAY THE GAS COMPANY SPOKESPERSON TOLD ME THAT THEY FOUND NO EVIDENCE OF A GAS LEAK THAT WOULD HAVE CAUSED THE TRAGEDY. BUT, THE COMPANY CONTINUES TO WORK WITH INVESTIGATORS. THE ALLEGHENY COUNTY FIRE TASK OF SORTING THROUGH THE CHARRED DEBRIS AND COMING UP WITH AN ANSWER. IF IT WASN'T A NATURAL GAS LEAK - WHAT WAS IT? TODAY WE KNOW THAT MR.PROBLEMS. HE AND SHE HAD FILED A 3 ABUSE ORDER AGAINST HIM 18 YEARS AGO. SHE FILED ANOTHER ONE THIS PAST MARCH.HE WAS ARRESTED FOR VIOLATING THAT RECENT PFA - IN APRIL. THAT'S WHAT WE KNOW. WHAT WE DON'T KNOW - IS WHAT CAUSED A HOUSE TO EXPLODE AND A NEIGHBORHOOD TO CHANGE FOREVER.Tina @ 1:19-1:29 "I don't want to comment on anything because we just don't know, we don't know what happened, I just hope that the people that were injured are ok." 3 3 MOON TOWNSHIP POLICE ARE WORKING WITH THE FIRE MARSHAL. WE'LL LET YOU KNOW WHEN WE LEARN MORE ABOUT THE INVESTIGATION. 3

Pittsburgh police say they used evidence lifted from Mocospace after the suspect uploaded acts to the site. The girl told police that he knew she was only 13 and that he would stalk and harass her, waiting for her to get off the school bus.